noun
lethal gene; lethal allele
Technical genetics term for a gene or allele that causes death of the organism, often before reproductive age.
このマウス系統は致死遺伝子を持っているため、ホモ接合体は生まれない。
This mouse strain carries a lethal gene, so homozygotes are not born.
Compound of 致死 (chishi, 'lethal') + 遺伝子 (idenshi, 'gene').